### There are 19 results

Broad Topics >

Calculations and Numerical Methods > Estimating and approximating

##### Age 7 to 11 Challenge Level:

Mr. Sunshine tells the children they will have 2 hours of homework.
After several calculations, Harry says he hasn't got time to do
this homework. Can you see where his reasoning is wrong?

##### Age 7 to 11 Short Challenge Level:

There are four equal weights on one side of the scale and an apple
on the other side. What can you say that is true about the apple
and the weights from the picture?

##### Age 5 to 11 Challenge Level:

What do you notice about the date 03.06.09? Or 08.01.09? This
challenge invites you to investigate some interesting dates
yourself.

##### Age 5 to 11 Challenge Level:

This activity challenges you to decide on the 'best' number to use in each statement. You may need to do some estimating, some calculating and some research.

##### Age 7 to 14 Challenge Level:

Here is a chance to play a version of the classic Countdown Game.

##### Age 7 to 11 Challenge Level:

Four Go game for an adult and child. Will you be the first to have four numbers in a row on the number line?

##### Age 11 to 14 Challenge Level:

Can you work out how many of each kind of pencil this student
bought?

##### Age 7 to 11 Challenge Level:

Make an estimate of how many light fittings you can see. Was your
estimate a good one? How can you decide?

##### Age 7 to 11 Challenge Level:

This challenge is a game for two players. Choose two of the numbers to multiply or divide, then mark your answer on the number line. Can you get four in a row?

##### Age 7 to 11 Challenge Level:

Find the exact difference between the largest ball and the smallest
ball on the Hepta Tree and then use this to work out the MAGIC
NUMBER!

##### Age 7 to 14 Challenge Level:

There are nasty versions of this dice game but we'll start with the nice ones...

##### Age 7 to 14 Challenge Level:

Some Games That May Be Nice or Nasty for an adult and child. Use your knowledge of place value to beat your opponent.

##### Age 7 to 11 Challenge Level:

Can you deduce the pattern that has been used to lay out these
bottle tops?

##### Age 11 to 16 Challenge Level:

From the information you are asked to work out where the picture
was taken. Is there too much information? How accurate can your
answer be?

##### Age 11 to 14 Challenge Level:

Who said that adding, subtracting, multiplying and dividing couldn't be fun?

##### Age 11 to 14 Challenge Level:

Examine these estimates. Do they sound about right?

##### Age 7 to 14 Challenge Level:

How might you use mathematics to improve your chances of guessing the number of sweets in a jar?

##### Age 11 to 14 Challenge Level:

Bluey-green, white and transparent squares with a few odd bits of
shapes around the perimeter. But, how many squares are there of
each type in the complete circle? Study the picture and make. . . .

##### Age 7 to 11 Challenge Level:

Dicey Operations for an adult and child. Can you get close to 1000 than your partner?